@MartinRosenau, the big difference between the IPv4 Private Addressing and the IPv6 Unique Local Addressing is that Private Addressing has no expectation of being unique (same addressing is expected to be reused in many places), but Unique Local Addressing has a high expectation that it is unique (same addressing is not expected to be used in more than one place).
IPv6 is a 128-bit address system which allows for a significantly higher number of addresses or devices at a single time. By comparison, this works out as: IPv4 (32 Bit)- 4,294,967,296 addresses (or 1 address or device per every 1.62 people) Configuration of Local Area Network (LAN) IPv6 Settings on Dec 12, 2018 RFC 4193 - Unique Local IPv6 Unicast Addresses RFC 4193 Unique Local IPv6 Unicast Addresses October 2005 3.1.1.Background There were a range of choices available when choosing the size of the prefix and Global ID field length. There is a direct tradeoff between having a Global ID field large enough to support foreseeable future growth and not using too much of the IPv6 address space needlessly. Paul's blog: IPv6 and internal networks Mar 24, 2011
Most devices will automatically assign a link-local address to any IPv6-enabled interface. This address is only meaningful within a given broadcast domain and cannot be reached from outside that broadcast domain. As a final: what IPv6 obsoletes is the need for private …
Jun 12, 2020
Paul's blog: IPv6 and internal networks
Use caution when setting filters to exclude these private address ranges. In some cases, Regional Internet Registries (RIRs) have issued adjacent address space to their customers and that space is in use on the global Internet. In August 2012, ARIN began allocating “172” address space to internet service, wireless, and content providers. IPv6 static Addressing and DNSv6 | Network World 5) Click on “Use the following IPv6 address” and in the IPv6 Address field, type in the IP address you want to use (in my case, I typed in fda8:06c3:ce53:a890:0000:0000:0000:0002) IPv6 Address Range Generator | UltraTools About this Tool. The Local IPv6 Range Generator will generate an 'almost unique' local IPv6 address range, per RFC4193.RFC4193 requires these IPv6 address ranges to be generated using a RFC4086 compliant random number generator. These IPv6 addresses are not … IPv6 Addressing, Subnets, Private Addresses | Network World